Compound



UNITED srAri s rENr OFFICE.

LEWIS D. SHIVLEY, OF KOKOMO, INDIANA.

COMPOUND.

No Drawing.

To all whom it may concern:

Be it known that I, Lnwrs D. SIIWLEY, a citizen of the United States, residing at Kokomo, in the county of Howard and State of Indiana, have invented a new and useful Compound, of which thefollowing 1s a specification.

This invention relates to a composition with matter for use in tempering high speed steel in water and to the process of tempering the Inetal.

One of the objects of the inyention is to provide a composition of this character which is inexpensive and which, when sprinkled on steel heated to the h gh temperature and subsequently dipped in water, will render the steel very hard and tough so as to be especially useful as a high-grade tool steel.

Vith the foregoing and other objects in view which will appear as the description proceeds the invention consists of the following ingredients substantially in the proportions stated:

Soda ash; 2 lbs. Borax 1 Boracic acid Sal ammoniac 2 oz. Saltpeter 1 Magnesia 2 Yellow prussiate of potash Potassium oyanid i Manganese 2 Sulfur 1- Red lead 5 The foregoing ingredients, with the ex.- ception of the-soda ash, are thoroughly mixed, dried, and reduced to a powder, after which the composition is ready for use. To five gallons of water are added the two pounds of soda ash. The steel to be treated is heated approximately to 1500 degrees F. On this heated steel the powdered preparation is. thoroughly sprinkled after which the metalis reheated to approximately 2250 degrees F. This highly heated metal is then dipped in the mixture of water and soda Specification of Letters Patent. Patented J 29 1920 Application filed October 16, 1919. Serial No. 331,126.

ash and it will be found, steel from the bath, that it has been tempered or hardened so as to constitute a highgrade tool steel.

In partial explanation of the foregoing operation it might be stated that after the metal has been heated the first time the composition is sprinkled on it and melts so as to form a coating. When the metal is again heated with this coating on it some of the ingredients of the coating impregnate the metal. It has been found that some chemical reaction upon the high speed metal takes place, but the exact nature of this reaction has not as yet been definitely determined. It has been proven by test, however, that steel hardened by the use of the composition such as herein described will stand up under greater heat and will take up and dispose of more heat while in use, than metal hardened by any other known process.

What is claimed is l. A composition of matter for use in term pering steel including the following ingredients substantially in the proportion stated, soda ash 2 lbs, borax 1 1b., boracic acid lb.. sal ammoniac 2 oz., saltpeter 1 oz., magnesia 2 oz., yellow prussiate of potash 1; oz., potassium cyanid :1- oz., manganese 2 oz., sulfur oz., red lead 5 oz., and water 5 gallons.

2. The herein described method of tempering steel which consists in heating steel to approximately 1500 degrees F., sprin kling upon the hot steel boraX, boracic acid, sal ammoniac, saltpeter, magnesia, yellow prussiate of potash, potassium cyanid, manganese, sulfur, and red lead, re-heating the metal to approximately 2250 degrees F., and

then immersing the metal in a bath consisting of 5 gallons of water and 2 pounds of soda ash.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

' LEWIS D. SHIVLEY.

l/Vitnesses:

LESLIE O. MoVEY, CHAS. JINKERSON..

on removing the 

